<div dir="ltr">Take a page or two from information theory - use a forward error correction code as part of the unique identifier, as well as a checksum. That way you can identify whether the address is corrupt.<div><br></div>
<div>Choose symbols that aren't going to clash - eg, all uppercase or numeric, no letter O (ie, number 0), no letter I (ie, number 1), etc, etc.</div><div><br></div><div><br></div><div>-adrian</div><div><br></div></div>
<div class="gmail_extra"><br><br><div class="gmail_quote">On 17 October 2013 12:05, Lee Sonko <span dir="ltr"><<a href="mailto:lee@lee.org" target="_blank">lee@lee.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr"><div>Sai, I'm intrigued! Here's some questions.</div><div><br></div>With current addresses, there is some built-in redundancy. Slightly misaddressed letters usually reach their destination now. What schemes can build in redundancy to this plan?<div>

Maybe forward error correction? A parity bit?<br><div><br></div><div>With this scheme, 1 incorrect character could send the letter to the other side of the world. If the letter is accidentally sent to, for instance, Guam, the post office will incur extra unneeded expense. How can such problems be avoided?</div>

</div><div>Maybe limiting the geographic delivery area. Internal checking of names against addresses</div><div><br></div><div>Junk mailers will want to be able to send mail to every home in a defined area. They do this now. It is a great source of revenue for the post office and some people actually like it. The proposal should include a way for people in a local area to still receive such mail. This seems easy to implement from a technical standpoint: the mailing lists would be handled confidentially by USPS.</div>

<div><br></div><div><br></div><div>I looked on your website. Your info is very complete and intensive. I got lost after 10 minutes of looking at it. Can you tell us laypersons about sending positive or negative feedback to USPS about your proposal?</div>